It's not really that complex if you understand or want to take the time to understand nurbs curves. Sorry if it was confusing, nurb's frighten a lot of people so I understand if you want to avoid them.

You can avoid nurbs curves all together for your project as the twisted pair does not have to follow a path (it's just 3 twists in a straight line). I just wanted to take the time (my time) to try and help you out with a general method for created twisted curves that follow any path.


But anyway here is the brute force way to accomplish your task....

Just create a pair of polygon helix's then manually extrude the end faces along the path you want.

That will work just fine, it just does not give you the flexibility and control you get by learning to use nurbs.

Best of luck on your project.